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 Post: #1 | Post subject: [HOW TO] Create a custom JB IOS4.2.1 firmware for iDevice
PostPosted: Wed Feb 16, 2011 3:28 pm 
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Sn0wbreeze 2.2 is out! Just like PwnageTool for Mac, you can now cook custom firmwares of iOS 4.2.1 on Windows without upgrading the baseband, which ultimately means that you can use ultrasn0w unlock software to unlock your phone on the older baseband.

Required Files:
Sn0wbreeze: http://ih8sn0w.com/index.php/download/f ... reeze22/pc
IOS 4.2.1: viewtopic.php?p=509542#p509542

Sn0wbreeze 2.2 supports all iDevices including the Apple TV !


Instructions are as follows:

Step 1: Download and install the latest version of iTunes.
Step 2: Now start iTunes and sync your iPhone with your PC so that it backs-up all your important data including settings, apps, music, contacts and photos.
Step 3: Download Sn0wbreeze 2.2 and the original iOS 4.2.1 firmware file for your version of iPhone or iPod touch. Move all these files to your desktop.
Step 4: Start Sn0wbreeze and select “Expert Mode”.
Step 5: Sn0wbreeze will now ask you to browse for your .ipsw file. Select the correct iOS 4.2.1 firmware .ipsw file by clicking the “Browse” button. Sn0wbreeze will verify the selected file and then will present you with following screens.
Also check “Activate The iPhone” if you are on unofficial carrier and want Sn0wbreeze to hacktivate your phone.
Step 7: Now simply select “Build IPSW”. Sn0wbreeze will now create the custom .ipsw file for your iPhone which will be jailbroken.
Step 8: Now you will have to restore your iPhone to this custom firmware 4.1 that you just cooked using Sn0wbreeze for your iPhone. Click on your phone from the sidebar in iTunes and then press and hold left “Shift” button on the keyboard and then click on “Restore” (Not “Update” or “Check for Update”) button in the iTunes and then release the “Shift” button.
This will make iTunes prompt you to select the location for your custom firmware 4.1. Select that custom .ipsw file and click on “Open”.
Step 9: Now sit back and enjoy as iTunes does the rest for you. This will involve a series of automated steps. Be patient at this stage and don’t do anything silly. Just wait while iTunes installs the new iOS 4.2.1 on your iPhone. Your iPhone screen at this point will be showing a progress bar indicating installation progress. After the installation is done, iPhone will restart automatically and you should now have a fully jailbroken iPhone running on iOS 4.2.1

How to: Unlock iOS 4.2.1 (Old Baseband):
Once you are done with the jailbreak, you can follow our step by step guide posted here to unlock your iPhone on iOS 4.x, on older baseband using Ultrasn0w.

Step 10: Once you are done with the unlocking and jailbreak process. You can now restore all your settings, apps, music, contacts and photos to the newly installed iOS 4.2.1 by restoring the backup that you made in Step 2 from iTunes.

Feel free to ask me any question here should you run into any problem during the jailbreak process.

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PostPosted: Wed Feb 16, 2011 3:28 pm 
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 Post: #2 | Post subject: Re: [HOW TO] Create a custom JB IOS4.2.1 firmware for iDevic
PostPosted: Thu Mar 10, 2011 7:13 pm 

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i followed the instructions but when i finish with number 7 it does the update by itself and ends up in a green window... afterwards i plug it back in to itunes and its still lock...

Ok, my bad... while on the green you do the restore...

After the reboot, i cant get it to unlock as it is in baseband 5.15.04, is there any update for this now?




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 Post: #3 | Post subject: Re: [HOW TO] Create a custom JB IOS4.2.1 firmware for iDevic
PostPosted: Fri Mar 11, 2011 9:47 am 
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yes, apparently there is an unlock that is being prepared. No ETA for now...

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 Post: #4 | Post subject: Re: [HOW TO] Create a custom JB IOS4.2.1 firmware for iDevic
PostPosted: Fri Apr 15, 2011 2:43 pm 

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use snowbreeze to cook your custom firmware such as IOs 4.2.1 but at the same time try converting your baseband to the ipad baseband, this way u can unlock ur device using ultrasnow. U have to select the ipad baseband once prompted by snowbreeze




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 Post: #5 | Post subject: Re: [HOW TO] Create a custom JB IOS4.2.1 firmware for iDevic
PostPosted: Wed May 04, 2011 7:07 am 

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I just did this and went to the ipad baseband. Now my GPS doesnt work.

I am:

iphone 3g 6.15.00 baseband with bootloader 5.9




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 Post: #6 | Post subject: Re: [HOW TO] Create a custom JB IOS4.2.1 firmware for iDevic
PostPosted: Mon May 30, 2011 9:31 pm 

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Location: Bosnia & Herzegovina
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Device: Iphone 3G
OS: iPhone OS
Use Fuzzyband method to downgrade it to 05.13.xx.




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 Post: #7 | Post subject: Re: [HOW TO] Create a custom JB IOS4.2.1 firmware for iDevic
PostPosted: Mon May 30, 2011 10:00 pm 

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Location: Bosnia & Herzegovina
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Device: Iphone 3G
OS: iPhone OS
I'm sorry just found on net that Fuzzyband works only with bootloader 05.08. My fault.




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 Post: #8 | Post subject: Re: [HOW TO] Create a custom JB IOS4.2.1 firmware for iDevic
PostPosted: Sat Jul 02, 2011 4:32 am 

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Device: iPhone 3G, Acer Iconia, BlackBerry 9800, ipad 2, samsung galaxy Y
OS: iPhone OS
I'm sorry but is this going to work on all iDevice ? including old iphone3G ? tks




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 Post: #9 | Post subject: Re: [HOW TO] Create a custom JB IOS4.2.1 firmware for iDevic
PostPosted: Thu Aug 18, 2011 6:24 am 

Posts: 79
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wii this work if my modem version is 05.15.04? Thanks




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 Post: #10 | Post subject: Re: [HOW TO] Create a custom JB IOS4.2.1 firmware for iDevic
PostPosted: Thu Aug 18, 2011 2:52 pm 
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Yes it will. This is just a jailbreak, not an UNLOCK.

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 Post: #11 | Post subject: Re: [HOW TO] Create a custom JB IOS4.2.1 firmware for iDevic
PostPosted: Fri Aug 19, 2011 2:42 pm 

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help, stuck at "Waiting for iBBS"...




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 Post: #12 | Post subject: Re: [HOW TO] Create a custom JB IOS4.2.1 firmware for iDevic
PostPosted: Mon Aug 22, 2011 8:45 am 
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Can you please detail what you did. we can't help without knowing all the details...

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 Post: #13 | Post subject: Re: [HOW TO] Create a custom JB IOS4.2.1 firmware for iDevic
PostPosted: Mon Aug 22, 2011 4:06 pm 

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hi, well, it would start going into recovery but gets stuck on "Waiting for iBBS"

i did it a few times over and finally i just did not release the home button on the last try and it went through to the green screen. i've successfully JB'd my iphone with this guide. thanks.

the only problem i have now is i don't have gps as i upgraded my baseband to ipad 6.15. hope a fix is forthcoming. thanks again for sharing this info ga!nusha.




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